Machines and machine tools for treatment of materials and for additive manufacturing, namely, 3D printers; parts of 3D printers, namely, extruders and heated extruders, nozzles and 3D printer components of plastic and of metal for use in printing processes, namely, nozzles, heatsinks, cooling and heating systems primarily comprised of air-cooled heatsinks, radiative heatsinks, cooling fans, pumped water cooling, thermoelectric peltier combined heating and cooling elements; parts of machines, ...